BY vs OSBC: Correlation
Measured on weekly returns over the past three years, Byline Bancorp, Inc. (BY) and Old Second Bancorp, Inc. (OSBC) carry a correlation of 0.83, a very strong link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BY and OSBC?
Over the past 3 years, BY and OSBC moved with a correlation of 0.83, which is very strong, meaning they move nearly in lockstep. Little has changed lately, as the 1-year reading of 0.82 lands near the 3-year figure. Over 5 years the correlation is 0.75, and the annualized covariance of weekly returns is 594.3 %².
Within BY's tracked universe of 70 assets, OSBC comes in at #30 by 3-year correlation. Neither side won the trailing year by much: +32.5% against +37.4%.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
BY vs OSBC: side by side
| BY (Byline Bancorp, Inc.) | OSBC (Old Second Bancorp, Inc.) | |
|---|---|---|
| 1-year return | +32.5% | +37.4% |
| 5-year return | +66.2% | +130.4% |
| Volatility (ann.) | 26.8% | 26.8% |
| Beta vs S&P 500 | 0.80 | 0.67 |
| Max drawdown (3Y) | -27.2% | -25.5% |
| Market cap | $1.7B | $1.3B |
| P/E (trailing) | 11.5 | 14.6 |
| Dividend yield | 1.15% | 1.07% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BY | OSBC |
|---|---|---|
| 2022 | -14.7% | +29.2% |
| 2023 | +4.3% | -2.4% |
| 2024 | +25.0% | +16.7% |
| 2025 | +2.0% | +11.3% |
| 2026 | +32.7% | +30.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BY and OSBC good diversifiers for each other?
Not really. At 0.83, the two trade almost as one position, and owning both buys little extra protection.
FAQ
What is the correlation between BY and OSBC?
Using weekly returns as of 2026-08-27: 0.83 over 3 years, with 0.82 over the last year and 0.75 over 5 years.
Is OSBC a good diversifier for BY?
Not really. At 0.83, the two trade almost as one position, and owning both buys little extra protection.
What does a correlation of 0.83 mean?
On the −1 to +1 scale, 0.83 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/by-vs-osbc.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/by-vs-osbc/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BY correlations · OSBC correlations
